Anything that says prenatal vitamin is good to take.
Yes it's OK many people take prenatals to get pregnant or for there hair so there safe
You can buy them and start taking them now they can't hurt anything.
I think its perfectly fine to start prenatal vitamins before you see the doctor.
I would get them, they are most important in the first trimester. And congrats momma! I bet that was an amazing mother's day :)